A scarce lens, more than the rigid black, even if Princelle thinks that 2000 items were made for both of them. No optical difference with the collapsible Industar 22.
One does not really know for which camera this lens was made. Perhaps the new-born Zorki 3, or KMZ prototypes which were common at the beginning of the fifties? Serial number of the present lens: 5003454 (Jacques M. coll.).